Woodworking tool



7 Nov. 16, 1937. T. L. HEDGPETH WOODWORKING TOOL Filed March 5, 1936 4Sheets-Sheet 2 A m %m j 1 KN T A MW v l.

Nov. 16, 1937.

T. L. HEDGPETH WOODWORKING TOOL 4 She't-Sheet 4 Filed March 5, 1936 kjZi' ya Patented Nov. 16, 1937 UNITED STATES PATENT OFFIE 2,099,519WooDWoaKING TooL Application March 5,

6 Claims.

The present invention relates to wood working tools, and is particularlyconcerned with jointers.

One of the objects of the invention is the provision of animprovedjointer structure which combines the features of solidity,smoothness and accuracy in the adjustment and operation of its parts.

Another object is the provision of an improved jointer having animproved extension arrangement whereby the jointer is adapted to handlelonger pieces of lumber and to prevent the bending of the relativelylong and slender work pieces upon the table.

Another object is the provision of an improved guide or fence forjointers and an improved mode of support for the fence whereby it may befirmly and rigidly held in any of a plurality of angular positions andat different distances from the cutter.

Another object is the provision of an improved adjustable tablestructure by means of which the two parts of the table of the jointermay be raised or lowered to various predetermined elevations todetermine the depth of cut in the work piece.

Other objects and advantages of the invention will be apparent from thefollowing description and the accompanying drawings, in which similarcharacters of reference indicate similar parts throughout the severalviews.

Referring to the four sheets of drawings accompanying thisspecification,

Fig. 1 is a top plan view of a jointer constructed according to thepresent invention;

Fig. 2 is a front elevational view in partial section, showing thedetails of structure of the table and cutter;

Fig. 3 is a side elevation taken. from the right end of Fig. l;

Fig. 4 is a vertical sectional view taken on the plane of the line 44 ofFig. 1, showing the details of support of the guide or fence;

Fig. 5 is a vertical sectional View taken on the plane of the line 5-5of Fig. 1, looking in the direction of the arrows, showing the detailsof structure of the cutter shaft support and the angular adjusting meansfor the guide;

Fig. 6 is a fragmentary sectional view taken on the plane of the line6-5 of Fig. 1, looking in the direction of the arrows, showing thedetails of structure of the connection between the supporting links forthe guide or fence and the clamping means for securing it in anypredetermined angular position;

1936, Serial No. 67,221

Fig. 7 is another sectional View, taken on the plane of the line 1-1 ofFig. 1, showing the relation of the various supporting elements of theguide or fence;

Fig. 8'is another fragmentary sectional view, taken on the plane of theline 88 of Fig. 1, looking in the direction of the arrows, showing thedetails of structure of the clamping means for securing the guide at anypredetermined distance from the cutter;

Fig. 9 is a sectional view, taken on the plane of the line 9-9 of Fig.2, showing the details of structure of the clamping arrangement.

Referring to Figs. 1 to 3, the jointer, which is indicated in itsentirety by the numeral l0, preferably consists of' a supporting base I!and a pair of movable table sections [2, I3, a cutting tool I4, and aguide or fence IS. The base I l comprises a cast metal member which issubstantially box-like in form, having an open bottom, and comprisingthe four side walls I6, ll, l8, l9 joined together.

These side walls are preferably provided with the integral feet 20located at each corner and having bolt apertures for thereception ofbolts or lag screws which secure the jointer to a foundation orsupporting bench or table. The top of the base member H is provided withthe sloping walls 2|, 22 which support the table sections l2 and [3 forsliding movement in such manner that these table sections approach orrecede from the cutter I4 and are adapted to be placed at variouspredetermined elevations.

For this purpose each top wall Zl, 22 may be formed with the dove-tailedgroove 23 for the reception of the downwardly projecting dovetailedguide formation 24, which is located on the lower side of each tablesection.

These grooves and dove-tailed formations 23, 24 slidably engage eachother, and since they extend diagonally upward toward the cutter fromthe end walls l6 and Hi, the table sections are adapted to move up anddown as the dove-tailed formation slides in its groove.

Each upper wall 2|, 22 is preferably formed with a portion of increasedthickness, having the transversely and diagonally upwardly extendingbore 25 for reception of the stub shaft 26, having a threaded bore 21.This stub shaft passes through a slot 28in the lower wall 29 of eachtable section and does not, therefore, interfere with the sliding actionof the table section.

Each table section is preferably formed with an upper flat surface 30, alower horizontally extending wall 3| which curves downwardly to meet thediagonal bottom wall 29, a flat end wall section 32, and a curved endwall section 33. The side wall portions 34 complete the hollow tablesections, all of these parts preferably being integral and formed withcast metal.

The curved wall 3! may be provided with a portion of increased thicknessabout a bore 35 which extends with its axis substantially parallel tothe direction of the dove-tailed groove and formation 23 and 24. Thisbore receives a shaft 35, having a crank 31 at its outer end and havinga thrust collar 38 just inside the wall 3|.

The threaded end 39 of shaft 36 is threaded into the bore 21 in stubshaft 26, and by rotate ing the shaft 35 with crank 31 the table sectionit! may be caused to progress in either direction slidably with respectto the base I I or lower the table section.

The right table section is preferably provided with scale 45, which maycomprise a small metal plate having printed thereon scale divisions toindicate the depth of cut and suitable indicia such as 0, A A

The base I! is also preferably provided with a small sheet metal pointer4| secured thereto by a screw bolt and having its point disposed abovethe scale 49. Since the scale 49 is disposed diagonally with respect toa vertical line, it indicates the vertical adjustment of this tablesection l3 on a larger scale and permits a more accurate adjustment thanany vertical scale.

Referring to Figs. 3 and 9, each table section is preferably providedwith means for clamping the table section in predetermined position withrespect to the base, which may comprise a screw member 42, which isthreaded into a bore 43 in the front wall H of the base, and is providedwith a knurled head 44. The end of the screw bolt 42 is adapted toengage a flat metal strip 45, which is located between the wall ofthe'groove 23 and the dove-tailed formation 24, suitable clearance beingprovided.

The metal strip 45 is held in place by a plurality of set screws 46,which have their rounded ends engaging in rounded sockets in the stripthe screws being so adjusted in their bores in the front wall I! thatthey hold the strip 45 in its position without clamping the dove-tailedformation 24. The clamping screw 42, however, is adapted to force thestrip 45 against the dovetailed formation 24, clamping this formationagainst the opposite side of groove 23 and secur ing the table sectionin any predetermined position.

Lock nuts 4l on set screws 46 hold these set screws in adjustedposition. Each table section preferably has its end wall 32 providedwith laterally projecting lugs 43, which have horizontally extendingbores 49. The two lugs 48 at each end of the table have their bores 49parallel to each other, and are adapted to slidably receive theextension shafts 5953. The table extensions each comprise a pair ofshafts 59, 5!, or 52, the shafts being slidably engaged in the bores 49and having their outer ends secured together by a transverse extensionframe'member 54.

This transverse extension frame member comprises a cast metal memberwhich-is formed with a pair of laterally projecting lugs suitablylocated to receive the ends of the shafts. The ends of the shafts aresecured in bores 55 in these lugs by being threaded into these bores orin other convenient fastening means, and the trans verse frame member isprovided with a pair of laterally projecting bearing flanges 51.

nions 50. so as to raise Each bearing flange has a bearing groove 58extending into it from the top, and a transverse roller 59 has itsaxially projecting trunnions 69 in the bearing grooves 58. The roller 59is substantially cylindrical and is so adjusted that it has its uppersurface tangent to the plane of the table section to which it issecured; that is, in the plane of the table top. In order to adjust thisposition of the roller 59 accurately the bearing brackets 5! arepreferably provided with .vertically extending bores GI for receivingthe set screws 52.

The bores 55 communicate with the grooves 58 so that the set screws 62may project into the grooves 59 and engage the lower edge of the trun-The trunnions may have their actual bearing support on the ends of theset screws 6|, so that the rollers 59 may be adjusted so that they havetheir uppermost surface exactly in the plane of the table top section towhich they are attached. Thus these roller extensions are adapted to'project beyond the ends 32 of the table sections and to support a workpiece at a considerable distance from the tool or cutter I4. This is ofparticular importance where relatively slender stock is being worked, asthe stock might otherwise sag at each end by bending upward at themiddle.

When the roller extensions are not being used,

they may be pushed in close to the ends of the table sections, and theymay be secured in any desired position by means of a clamping screw bolt63, which is located in a threaded bore in the lug 48 and adapted toengage one'of the shafts 59 or 5|, 52 or 53.

Referring to Fig. 1, the trunnions 69 of the rollers 59 may beheld inthe grooves 58 by the heads of screw bolts 63, which are threaded intothe threaded bores located so closely to the grooves 58 that the beveledlower surfaces of the heads of bolts 63 overhang the trunnions 60.

The adjustment of these screw bolts also permits the trunnions to beraised and lowered, since these screw bolts may be withdrawn as the setscrews 92 are threaded into the bearing brackets.

One of the table sections, such as the section l2, may be provided inone of its walls, such as the rear Wall, with an integral tubularformation 54 (Fig. 4), having an axially extending bore 65, which'hasits axis located parallel to the plane of the table and parallel to theaxis of the cutter. This bore may fixedly support a stub shaft 66, whichis preferably provided with a groove 61, formed with two flatintersecting plane surfaces so as to be substantially triangular insection.

The shaft 66 maybe secured in bore 95 with its groove uppermost, bymeans of a set screw member 98, which has a non-circular socket 59 forengaging a wrench, and which is provided with a cup-shaped end 10adapted to grip the shaft 66 and hold it securely.

The groove 91 is adapted to engage the complementary frusto-conical endI I .of a hand screw 12, having a knob 13. This hand screw is carried bya fence supporting collar 14, comprising a cast metal member formed withan upper attaching flange 15 and with a lower body portion having a boreI6 for slidably receiving the shaft 65. V

A threaded bore Tl extends through the body 74 from the top and receivesthe threaded hand screw 12. The body 14 is adapted'to support theattaching flange T8 of a fence supporting fixture 19. The attachingflange 18 is provided with a centrally located aperture 89 for passingthe hand screw 12 and for rotatably mounting this fixture I9 on the handscrew. Both the attaching flange I8 and the-body 14 of the collar may beprovided with the curved peripheries 81 and 82, and the latter maysupport a pointer 83 which is secured thereto by a screw bolt 94.

The peripheral surface BI is located at a predetermined radius from thecenter of hand screw 12 so that when the fixture I9 is rotated on thisscrew I2 the surface 8| moves adjacent the pointer 83. Surface 8I may beprovided with a single mark for the purpose of indicating the positionof the fixture when the fence is at right angles to the axis of acutting tool, or it may be provided with any desired. angular indicia toindicate this and/or other positions.

The collar body I4 has its attaching flange I5 provided with threadedbores 85 for the securing bolts 86. These bolts may be provided withwashers and pass through elongated slots 81 in the attaching flanges I8,the slots permitting movement of the fixture I9 with respect to theattaching bolts 86 when the bolts are loosened.

As a general rule, the bolts 86 may be driven home to secure the fixtureI9 in such position that the fence extends parallel to the edges of thetable sections or at right angles to the axis of the cutting tool.

The fence supporting fixture I9 has a forwardly extending body portioncarried by attaching flange I8 and provided with a pair of upwardlyextending bearing portions 85', 86. These bearing portions may be'joinedby "the upwardly extending reinforcing ribs 81', and they are providedwith alignedbores 88 for receiving the shaft 89. The shaft 89 isrotatably supported in bores 88, and is provided at each end with thrustcollars 99, 9|, each thrust collar being secured on the shaft by anappropriate set screw.

The shaft also carries a radially projecting handle 92, which isprovided with a reduced threaded end 93 that is threaded home in athreaded bore 94 in the shaft. The bearing portion 86' preferably has acurved upper surface formed at the same radius from the center of shaft89 as thrust collar 99 so that the bearing portion 86 may support apointer 95 adjacent a scale 99 carried by thrust collar 90.

The scale 99 is preferably provided with angular indicia and scaledivisions, the indicia beginning at zero in the middle of the scale andextending in both directions from the middle, such as 0, 15, 30, and 45degrees. The pointer 95 may consist of a small sheet metal pointerformed withan attaching flange 91 at right angles to the pointer andsecured by a screw bolt 98 to the bearing portion 86'.

The pointer 95 may be turned slightly on the screw bolt 98 to effect anadjustment of the proper position for the end of the pointer, afterwhich it may be clamped in place by the screw bolt 98.

The fence or guide I5 preferably comprises a cast metal member ofsubstantially rectangular shape in elevation, provided with a fiatmachined forwardsurface 99 for engaging the work piece. It may haverearwardly projecting reinforcing ribs I99 at its border and extendingfrom the bottom to the top at various points throughout its length,particularly at points directly opposite the thrust collars 99 and 9|.

' and adapted to receive the pivot bolts I9I,II9.

Each pivot bolt I9'I--I I l! is preferably provided with spring washersso that the nuts on the bolts may resiliently clamp the flanges I99-I95and assist in holding the fence in'predeterinined position, after it hasbeen adjusted.

.The pivot bolts Itl-I I9 pass through the ends of a plurality of linksIII-H4. The opposite end of each link is provided with an aperture I 5for receiving the pivot bolts l It-I E9. The pivot bolts H8 and H8 mayconsist of bolts having an enlarged trunnion portion I29 and a reducedthreaded portion I2 I, so that they may be threaded home in threadedbores I22 in the thrust collars 98, 9|. The pivot bolts II! and H9 maybe identical in shape and construction, except that the head is replacedby an enlarged knob I23,

7 which may be grasped by the hand for the pur- The thrust collars,fence and linksv Ill, IM'

form two parallelogram linkages, one at each end of the shaft 89, and bythis means the fence or guide I5 may be supported above the table sections in any of a plurality of predetermined positions, as shown in Fig.7.

In orderv to effect an adjustment of this fence, it is only necessary tograsp the handle 92, after loosening the clamping bolts II 1, M9 bymeans of knobs I23, and the pivotal movement of shaft 89 causes acorresponding angular movement of the fence I5. When the fence is at thedesired position, as indicated by the pointer 95, the knobs I23 are usedto drive the bolts Ill, I I9 home and clamp the linkages in thatposition. The base II has its front wall I! and rear wall I9 providedwith bearing supporting formations comprising the partially cylindricalsockets or bores I24, I25. Each of these sockets or bores is formed inthe base during the casting operation, and each one is formed by aninwardly extending flange I26, I21, which has a vertically extendingbore I28 for receiving the screw bolts I29, I39.

The side walls of the sockets I24, I25 are also formed with transversethreaded bores on each side of the bearing supporting members I3I, I32for receiving set screws I33, which also assist in clamping the bearingsupporting members ISI, I32 in place in the bores I24, I25. The screwbolts I29, I39 pass through the bores I28, and are threaded intothreaded bores I34 in the bearing supporting members to secure thesebearing sup porting members in the sockets.

The cutter I4 is fixedly mounted upon the shaft I35 for rotation about ahorizontal axis,

and preferably comprises an integral enlargedistance from such axis.

The outer race I39 is a frictional fit in a cylindrical bore I66 formedin the bearing supporting member MI.

The bearing supporting member I3I comprises a substantially cylindricalmetal member having the bore I 56 in one side for receiving the ballbearing race I 39. It is secured in place by the bolt I 28 and by setscrews on each side which pass through the walls of the flanges I 26. Itmay also have a threaded bore MI communicating with the here i 46 andclosed by a screw plug I 42 to provide access to the bearing for oiling.

The reduced end I36 of the shaft may also have a slight taper, ifdesired, for securing the race I31 in place. The shaft I35 is preferablyprovided with a slight enlargement adjacent the body of the cutter I5,forming the annular shoulder I43, which engages the edge of inner race I44. This shaft end is rotatably mounted in a ball bearing assemblycomprising the inner race I44, balls I45,

outer race I446.

The outer race Miimay be mounted in a cylindrical socket I41 in thebearing member I48. Bearing member I48 may be secured in the bearingsupporting member I32 by a pair of set screws which engage in an annulargroove in the bearing member I68. The bearing supporting member E32comprises a sleeve having the cylindrical bore 556 for receiving thebearing member M6, and having the threaded bores ISI for the set screwsI 35.

The shaft I35 is preferably provided with a suitable pulley I 52 fordriving the cutter. The body of the cutter I4 comprises a substantiallycylindrical member which is formed with a plurality of grooves for thereception and to permit the clamping of the cutter blades I553.

The grooves E56 are of suflicient sizeto receive the cutter blades, andthey extend at a slight angle to a radial line and are equally spacedabout the periphery of the cutter body. These grooves extendlongitudinally of the cylindrical body and are located in a plane whichis parallel to the axis of the body and shaft. The body is alsopreferably provided with relatively narrow slots or grooves 55, one ofsuch slots being provided for each blade slot I54.

The slots I55 extend transversely to the blade slots 55%, preferably atsubstantially right angles, and extend almost to the slots I54, leavinga relatively narrow neck of material connecting the clamping portion I56with the main body of the cutter. This gives the clamping portion I56resilient characteristics, and it is provided in each case with aplurality of transverse bores I51 for receiving set screws I58 thatclamp the blade in place.

Each blade I53 comprises a fiat piece of suitable tool steel which has acutting edge produced by means of a bevel I59 on the rear side of theblade. The blades are all so disposed in the cutter body that theircutting edges I66 are parallel to the axis of the body and shaft and atthe same radial Any number of cutter blades may be used, and in thepresent embodiment three cutter blades have been equally spaced aboutthe periphery of the cutter body I4.

The body is also preferably provided with a. shallow partiallycylindrical groove I6I, extending longitudinally of the cylindrical bodyin front of each blade I53 for directing shavings which come from thecutter blade edge I66. This curved surface tends to cause the shavingsto curl away from the blade, and helps to effect a removal of theshavings fromthe vicinity of the blade.

The table section I3 differs from the table section I2 also in the factthat it is preferably provided with an integral guard extension I62.This guard extension comprises a continuation of the top of the table,which is bordered by a depending border flange I63 for reinforcement. Itprojects forwardly from the table section I3, and then extendslongitudinally past the end of the shaft I36 into a position adjacentthe end of table section I2. The table section I3 is also provided witha laterally projecting lug I64 having a vertically extending bore I65for receiving a stub shaft I66 that carries a movable guard I 61.

The movable guard I61 comprises a cast metal member of sufficient lengthand width so that its main body I66 covers the cutter opening I69 whichexists between the table sections I2 and I3. It is provided with adiagonally and vertically extending arm. I16 extending over and abovethe bore I65, and has a vertically extending bore I1I within which theshaft I66 is secured. Shaft I66 thus serves to mount the guard I61 forrotation in the bore I65. I The guard I61 is also preferably providedwith a depending border flange I12 for reinforcement purposes, and witha depending slide flange I13, which is located at such a radius to theshaft I66 that it can never strike the cutter I4. It slidably engagesthe top of table section I3.

The guard I61 also has inwardly extending lug formation I14 providedwith a bore I15 for receiving a pin I16 fixedly secured therein andserving as a stop for engaging the grooved stop surface I11 formed inthe edge of the table section I3. A helical spring I11 has one endhooked in a cotter pin I18 which is secured in a bore in the guardextension wall I63, and the spring has its opposite end secured in acotter pin located in a bore in a laterally projecting lug I19 carriedby guard I61.

Spring I11 thus urges the guard I61 into the position of Fig. 1, fromwhich it may be moved by hand or by any work piece which engages thebeveled work-engaging surface or wall I86 on the arm I16. The angle ofthis wall I86 is such, with respect to the direction of passage of worklongitudinally of the tables, that a piece of lumber en gaging the wallI86 cams the guard I61 downward in Fig. 1; that is, laterally withrespect to the top of the table. As soon as the work has passed, theguard I61 moves back into the position of Fig. 1, covering the cutterand preventing injury.

The stop pin I16 is intended to prevent the guard I61 from hitting thefence I at this time, since the blows so struck by the guard mightotherwise change the adjustment of the fence. If desired, the dependingborder flange of the table section I3 may be provided with a set screwadjustably engaging the pin I16 so as to set the final position of theguard I61 in accordance with the placing of the fence I5 to preventcontact between the guard and fence at every adjustment of the fence.

While I have illustrated a preferred embodiment of my invention, manymodifications may be made without departing from the spirit of theinvention, and I do not wish to be limited to the precise details ofconstruction set forth, but desire to avail myself of all changes withinthe scope of the appended claims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States, is:

1. In a wood working tool, the combination with a table section movablymounted on said base, a cutter carried by said base, said table havingbores located in parts of said table extending parallel to the tabletop, a pair of rods, each rod being mounted in a bore in said tablesection, the two adjacent ends of said rods being joined by a transverseframe member located outside said table whereby said transverse framemember may be located at a point spaced from, said table and supportedfrom said table by said rods to provide an extension of said table, saidtransverse frame member having a pair of bearings and a roller havingits trunnions located in said bearings to support the work, said rollerbeing secured in place in said bearings by the over-hanging heads ofthreaded members threaded into said transverse frame member.

2. In a Wood planer, the combination of a sup-- port with a suitablecutter mounted for rotation about a horizontal axis, a work tablecomprising a pair of movable table members adapted to be elevated orlowered with respect to the cutter, to determine the depth of cut, saidtable members having substantially horizontal upper work surfaces, andan extension for each of said work table members, said extensions beingslidably mounted on said members and extending in opposite directionstherefrom and having a supporting roller on each extension, the uppersurface of which is adapted to be adjusted to the plane of work surfacesof said table members, for the purpose of supporting a long board atwidely spaced points, to prevent its bowing upward on the table abovethe cutter, due to the weight of the projecting ends of the board, saidtable members being provided with parallel cylindrical bores, and saidextension comprising a transverse metal frame member supporting a pairof cylindrical rods in parallel relation for sliding movement in saidbores, said transverse frame member having bearing lugs provided withvertically elongated grooves, said roller having trunnions in saidgrooves, and adjustable threaded means mounted in the base of saidgrooves, to determine the elevation of each roller with respect to itstable member.

3. In a wood planer, the combination of a support with a suitable cuttermounted for rotation about a horizontal axis, a work table comprising apair of movable table members adapted to be elevated or lowered withrespect to the cutter, to determine the depth of out, said table membershaving substantially horizontal upper work surfaces, and an extensionfor each of said work table members, said extensions being slidablymounted on said members and extending in opposite directions therefromand having a supporting roller on each extension, the upper surface ofwhich is adapted to be adjusted to the plane of work surfaces of saidtable members, for the purpose of supporting a long board at widelyspaced points, to prevent its bowing upward on the table above thecutter, due to the weight of the projecting ends of the board, saidtable members being provided with parallel cylindrical bores, and saidextension comprising a transverse metal frame member supporting a pairof cylindrical rods in parallel relation for sliding movement in saidbores, said transverse frame member having bearing lugs provided withvertically elongated grooves, said roller having trunnions in saidgrooves, and adjustable threaded means mounted in the base of saidgrooves, to determine the elevation of each roller with respect to itstable member, said trunnions being secured in said grooves by a threadedmem-- ber threaded into said bearing lugs adjacent said grooves, andhaving its head over-hanging said trunnions in said grooves.

4. In a table extension, the combination of a support provided with apair of parallel cylindrical bores, a pair of cylindrical rods adaptedto be slidably mounted in said bores, said cylindrical rods having theirouter ends fixedly mounted in a transverse frame member, with the rodsin parallel position, said transverse frame member having bearing lugsprovided with upwardly open grooves, a roller having trunnions ofreduced size at each end, mounted for rotation in said grooves, andmeans for securing said trunnions in said grooves, comprising threadedmembers having their shanks threaded into threaded bores in each of saidbearing lugs, and having their heads over-lying said trunnions, toprevent withdrawal of the trunnions from the bearing grooves.

5. In a table extension, the combination of a support provided with apair of parallel cylindrical bores, a pair of cylindrical rods adapted-to be slidably mounted in said bores, said cylindrical rods havingtheir outer ends fixedly mounted in a transverse frame member, with therods in parallel position, said transverse frame member having bearinglugs provided with upwardly open grooves, a roller having trunnions ofreduced size at each end, mounted for rotation in said grooves, andmeans for securing said trunnions in said grooves, comprising threadedmembers having their shanks threaded into threaded bores in each of saidbearing lugs, and having their heads overlying said trunnions, toprevent Withdrawal of the trunnions from the bearing grooves, each ofsaid bearing grooves communicating with a threaded bore at its base, anda threaded member in each of said bores engaging and supporting atrunnion, whereby the upper surface of the roller may be brought intothe plane of a work surface carried by said supporting member.

6. In a wood planer, the combination of a support with a suitable cuttermounted for rotation about a horizontal axis, a work table comprising apair of movable table members adapted tobe elevated or lowered withrespect to the cutter, to determine the depth of cut, said table membershaving substantially horizontal upper work surfaces, and an extensionfor each of said work table members, said extensions being slidablymounted on said members and extending in opposite directions therefromand having a supporting roller on each extension, the upper surface ofwhich is adapted to be adjusted to the plane of Work surfaces of saidtable 'members, for the purpose of supporting a long board at widelyspaced points, to prevent its bowing upward on the table above thecutter, due to the weight of the projecting ends of the board, saidextensions being provided with bearing grooves, and said rollers havingtrunnions at each end of each roller, and adjustable threaded means insaid bearing grooves whereby each end of each roller may be separatelyadjusted to bring the rollers into parallel relation with the table top.

'I'HERON L. HEDGPETH.

